Building ports for older arch

[abishai]

Hello, I compile ports on i7-2600 box for Xeon X5680 CPU, however I noticed 1 port that aborts with SIG4 (illegal instruction). Compiling on X5680 produces correct build material, so I wonder, what is the best way to overcome this issue? It's so strange to see the difference between (almost) the same CPUs

 

[SirDice]

Compiling on X5680 produces correct build material, so I wonder, what is the best way to overcome this issue?

Make sure you don't have any "optimizations" in /etc/make.conf.

 

[abishai]

Sure. My optimizations are port options only.
But looks like I need one: architectures are not the same, i7-2600 is Sandy Bridge and X5680 is Westmere. New instruction set was introduced in Sandy Bridge: https://en.wikipedia.org/wiki/Advanced_Vector_Extensions
Tricky!
I wonder now, how FreeBSD ports are compiled to avoid issues on different CPUs.

 

[Sevendogsbsd]

I don't understand - they are both x86_64. I thought that was all that mattered. I build on a Xeon X5550 for an i7 7700, that works, never tried the other way around.

 

[abishai]

And here we are https://github.com/freebsd/freebsd/blob/master/share/mk/bsd.cpu.mk#L271
Look like I need to set "westmere" explicitly. This will disable avx instructions. I thought this stuff is detected in runtime.